The Roman Philosopher Lucius Anneaus Seneca (4 BCE-65 CE) was perhaps the first to note the universal trend that growth is slow but ruin is rapid. I call this tendency the "Seneca Effect."
Showing posts with label Gaia. Show all posts
Showing posts with label Gaia. Show all posts

Monday, April 4, 2022

God is dead, and Gaia is not that well either. Who Remains to Defend Humankind?




Meeting the Goddess Gaia in a Supermarket, Italy. Frankly, as a mystical experience, it left much to be desired.



On September 13, 258, Cyprian, bishop of Carthage, was imprisoned on the orders of the new proconsul, Galerius Maximus. The public examination of Cyprian has been preserved.


Galerius Maximus: "Are you Thascius Cyprianus?" 
Cyprian: "I am." 
Galerius: "The most sacred Emperors have commanded you to conform to the Roman rites." 
Cyprian: "I refuse." 
Galerius: "Take heed for yourself." 
Cyprian: "Do as you are bid; in so clear a case I may not take heed." 
Galerius, after briefly conferring with his judicial council, with much reluctance pronounced the following sentence: "You have long lived an irreligious life, and have drawn together a number of men bound by an unlawful association, and professed yourself an open enemy to the gods and the religion of Rome; and the pious, most sacred and august Emperors ... have endeavoured in vain to bring you back to conformity with their religious observances; whereas therefore you have been apprehended as principal and ringleader in these infamous crimes, you shall be made an example to those whom you have wickedly associated with you; the authority of law shall be ratified in your blood." He then read the sentence of the court from a written tablet: "It is the sentence of this court that Thascius Cyprianus be executed with the sword." 
Cyprian: "Thanks be to God.”

There are plenty of documents about martyrs from early Christianity that look to us naive and exaggerated. But this one, no. This is so stark, so dramatic, so evident. You can see in your mind these two men, the Imperial procurer Galerius Maximus and the Bishop of Carthage, Thascius Cyprian, facing each other in anger, a clash that reminds to us the story of the aircraft carrier that tried to order a lighthouse to move away. It was an unstoppable force, the carrier, meeting an unmovable object, the lighthouse. It is the kind of clash that leads to human lives blown away like fallen leaves in the wind. 

Galerius plays the role of the carrier, bristling with weapons, power, and movement. He is not evil. He does what he has to do. For him, just as for most Romans of the time, performing the "sacred rituals" was a simple way to show that one was part of society, willing to do one's duty. It implied little more than small offerings to the Roman deities. Doing that was the basis of the virtue carried "pietas," that later Christians would call "Caritas" and that in our terminology we might call "empathy." Why would anyone refuse to do such a simple thing? He had to be truly evil, wicked, and a criminal. 

But Galerius must also have seen that he had a force in front of him that he could not possibly overcome. The lighthouse doesn't move. It cannot be moved. A man like Cyprianus, alone, was worth more than a Roman Legion. It was worth more than all the Roman Legions. A few decades later, the Empire would be ruled by a Christian Emperor, Constantine. More decades in the future, the Empire would collapse and be replaced by Christianity to start the flowering of that delicate and sophisticated civilization we call the "Middle Ages" in Europe.

In the end, the essence of the conflict that put Galerius and Cyprianus in front of each other was about the role of a totalitarian state. By the 3rd century AD, when this story took place, the Roman Empire had been a totalitarian state for at least three centuries. "Totalitarian" means that there is nothing, strictly nothing, that can stop the state from doing what the state wants to do and that the state itself defines as "the law". In the Roman laws, there was no such thing as "human rights," and nothing like a "Constitution." The law was the law, and it had to be obeyed. But who created the law? On what principles? For what purposes? It was a difficult point that needed to be clarified.

It was only much later that the Roman Emperors started understanding that the laws that they cherished so much had been turned into a tool of oppression and mistreatment of the poor and the weak. It was Empress Galla Placidia the first to say that "That the Emperor profess to be bound by the laws is a sentiment worthy of the ruler's majesty, so much is our power dependent on the power of law and indeed that the imperial office be subject to the laws is more important than the imperial power itself."  It was the way to go, but too late. Galla Placidia was not only the last Western Empress, she was the last person who actually ruled the Western Empire. When she was gone, the Empire collapsed like a house of cards. 

If Christianity won the struggle for the souls and minds of the Europeans of the 1st millennium of our era, the state was eventually to return with the age that today we call the "enlightenment" -- a curious mockery of a religious concept for an entity, the state, which recognizes none. Nowadays, we tend to see religion as a set of various superstitions, something that gives people some delusionary belief about the after-death world, maybe some philosophic reasoning on how to live a virtuous life; and don't do that or you'll go blind! But if you think about the clash between Galerius and Cyprianus, you see that it was a completely different story. Religion was a tool to defend people from the arbitrary laws of the totalitarian state. Christianity established the basic dignity of every human being and gave people an alternative social and cultural structure. The holy books were the "Constitution" of the Christian state. 

Over the years, this concept of what it means to be a Christian in a secular state was gradually lost. The last time when Christianity and the State clashed against each other in a serious struggle was with the "Controversy of Valladolid," when the Christian Church tried to prevent the European States from enslaving and exterminating the Native Americans. It was a hollow victory for the Church, and it led, eventually, to its disappearance as an independent force in the Europe we call "modern." Under the onslaught of the state propaganda, the roles in the struggle were completely inverted, and the fault for the extermination of the population of two entire continents fell straight on the Church, exactly the entity that had tried to defend the natives. We thought that the evils of the return of totalitarian states could be kept at bay using tools operating within the state itself: opposition parties, constitutional laws, statements about human rights, and the like. 

It didn't work, Today, we find ourselves in exactly the same situation as when Emperor Decius imposed on every Roman Citizen to demonstrate his/her pietas by performing sacrifices to the sacred deity that, in our case, is called "science." But, unlike the times of Decius, we have nothing to oppose to the totalitarian machine of the state that is marching on to crush all of us. Right now, there is no Cyprian to stand for the people and accept martyrdom in the name of human rights.  

I have been thinking a lot about the Gaian religion, fashionable among Western intellectuals. Would Gaianism play the same role in our age that Christianity played nearly two millennia ago? Would anyone follow the example of Cyprianus and offer his or her life in the name of Gaia? Right now, obviously not. Gaians had a good occasion with the Covid story to take an independent position about an issue that ordinary Christians were not equipped to face. Over history, facing an epidemic, Christianity could only say that it was the result of the wrath of God because someone had sinned heavily. Gaianism, instead, has much more powerful intellectual tools that could have been used. Gaians could have told people that they were damaging their health just while trying to save themselves. That their immune system is a gift from Gaia herself that they must keep strong by keeping it in contact with the external environment. Exactly the opposite of trying to isolate themselves by wearing masks, disinfecting everything, and keeping social distance. 

Unfortunately, that didn't happen, and Gaianism remained little more than a vaporous set of "green" feelings and feel-good recommendations. But it is shallow, lightweight, and easily blown away by the first serious blast of propaganda created by the state machine. And yet we desperately need something that will save us from being crushed by these monstrous machines. Will Gaia ever gain the strength of Christianity? Right now, I am doubtful, but also not without some hope. Things always change, sometimes very fast. 

Here is a reflection on Gaianism that I published two years ago on my "Chimeras" blog when the situation was not yet as dramatic as it is today. 

Gaia, the Return of the Earth Goddess





House founded by An, praised by Enlil, given an oracle by mother Nintud! A house, at its upper end a mountain, at its lower end a spring! A house, at its upper end threefold indeed. Whose well-founded storehouse is established as a household, whose terrace is supported by Lahama deities; whose princely great wall, the shrine of Urim! (the Kesh temple hymn, ca. 2600 BCE)

Not long ago, I found myself involved in a debate on Gaian religion convened by Erik Assadourian. For me, it was a little strange. For the people of my generation, religion is supposed to be a relic of the past, the opium of the people, a mishmash of superstitions, something for old women mumbling ejaculatory prayers, things like that. But, here, a group of people who weren't religious in the traditional sense of the word, and who included at least two professional researchers in physics, were seriously discussing how to best worship the Goddess of Earth, the mighty, the powerful, the divine, the (sometimes) benevolent Gaia, She who keeps the Earth alive.

It was not just unsettling, it was a deep rethinking of many things I had been thinking. I had been building models of how Gaia could function in terms of the physics and the biology we know. But here, no, it was not Gaia the holobiont, not Gaia the superorganism, not Gaia the homeostatic system. It was Gaia the Goddess.

And here I am, trying to explain to myself why I found this matter worth discussing. And trying to explain it to you, readers. After all, this is being written in a blog titled "Chimeras" -- and the ancient Chimera was a myth about a creature that, once, must have been a sky goddess. And I have been keeping this blog for several years, see? There is something in religion that remains interesting even for us, moderns. But, then, what is it, exactly?

I mulled over the question for a while and I came to the conclusion that, yes, Erik Assadourian and the others are onto something: it may be time for religion to return in some form. And if religion returns, it may well be in the form of some kind of cult of the Goddess Gaia. But let me try to explain

What is this thing called "religion," anyway?

Just as many other things in history that go in cycles, religion does that too. It is because religion serves a purpose, otherwise it wouldn't have existed and been so common in the past. So what is religion? It is a long story but let me start from the beginning -- the very beginning, when, as the Sumerians used to say "Bread was baked for the first time in the ovens".

A constant of all ancient religions is that they tell us that whatever humans learned to do -- from fishing to having kings -- it was taught to them by some God who took the trouble to land down from heaven (or from wherever Gods come from) just for that purpose. Think of when the Sumerian Sea-God called Aun (also Oannes in later times) emerged out of the Abzu (that today we call the abyss) to teach people all the arts of civilization. It was in those ancient times that the Gods taught humans the arts and the skills that the ancient Sumerians called "me," a series of concepts that went from "music" to "rejoicing of the heart." Or, in more recent lore, how Prometheus defied the gods by stealing fire and giving it to humankind. This story has a twist of trickery, but it is the same concept: human civilization is a gift from the gods. Now, surely our ancestors were not so naive that they believed in these silly legends, right? Did people really need a Fish-God to emerge out of the Persian Gulf to teach them how to make fish hooks and fishnets? But, as usual, what looks absurd hides the meaning of complex questions.

The people who described how the me came from the Gods were not naive, not at all. They had understood the essence of civilization, which is sharing. Nothing can be done without sharing something with others, not even rejoicing in your heart. Think of "music," one of the Sumerian me: can you play music by yourself and alone? Makes no sense, of course. Music is a skill that needs to be learned. You need teachers, you need people who can make instruments, you need a public to listen to you and appreciate your music. And the same is for fishing, one of the skills that Aun taught to humans. Of course, you could fish by yourself and for your family only. Sure, and, in this way, you ensure that you all will die of starvation as soon as you hit a bad period of low catches. Fishing provides abundant food in good times, but fish spoils easily and those who live by fishing can survive only if they share their catch with those who live by cultivating grains. You can't live on fish alone, it is something that I and my colleague Ilaria Perissi describe in our book, "The Empty Sea." Those who tried, such as the Vikings of Greenland during the Middle Ages, were mercilessly wiped out of history.

Sharing is the essence of civilization, but it is not trivial: who shares what with whom? How do you ensure that everyone gets a fair share? How do you take care of tricksters, thieves, and parasites? It is a fascinating story that goes back to the very beginning of civilization, those times that the Sumerians were fond to tell with the beautiful image of "when bread was baked for the first time in the ovens," This is where religion came in, with temples, priest, Gods, and all the related stuff.

Let's make a practical example: suppose you are on an errand, it is a hot day, and you want a mug of beer. Today, you go to a pub, pay a few dollars for your pint, you drink it, and that's it. Now, move yourself to Sumerian times. The Sumerians had plenty of beer, even a specific goddess related to it, called Ninkasi (which means, as you may guess, "the lady of the beer"). But there were no pubs selling beer for the simple reason that you couldn't pay for it. Money hadn't been invented, yet. Could you barter for it? With what? What could you carry around that would be worth just one beer? No, there was a much better solution: the temple of the local God or Goddess.

We have beautiful descriptions of the Sumerian temples in the works of the priestess Enheduanna, among other things, the first named author in history. From her and from other sources, we can understand how in Sumerian times, and for millennia afterward, temples were large storehouses of goods. They were markets, schools, libraries, manufacturing centers, and offered all sorts of services, including that of the hierodules (karkid in Sumerian), girls who were not especially holy, but who would engage in a very ancient profession that didn't always have the bad reputation it has today. If you were so inclined, you could also meet male prostitutes in the temple, probably called "kurgarra" in Sumerian. That's one task in which temples have been engaging for a long time, even though that looks a little weird to us. Incidentally, the Church of England still managed prostitution in Medieval times.

So, you go to the temple and you make an offer to the local God or Goddess. We may assume that this offer would be proportional to both your needs and your means. It could be a goat that we know was roughly proportional to the services of a high-rank hierodule. But, if all you wanted was a beer, then you could have limited your offer to something less valuable: depending on your job you could have offered fish, wheat, wool, metal, or whatever. Then, the God would be pleased and, as a reward, the alewives of the temple would give you all the beer you could drink. Seen as a restaurant, the temple worked on the basis of what we call today an "all you can eat" menu (or "the bottomless cup of coffee," as many refills as you want).

Note how the process of offering something to God was called sacrifice. The term comes from "sacred" which means "separated." The sacrifice is about separation. You separate from something that you perceived as yours which then becomes an offer to the local God or to the community -- most often the same thing. The offerings to the temple could be something very simple: as you see in the images we have from Sumerian times, it didn't always involve the formal procedure of killing a live animal. People were just bringing the goods they had to the temple. When animals were sacrificed to God(s) in the sense that they were ritually killed, they were normally eaten afterward. Only in rare cases (probably not in Sumeria) the sacrificed entity was burnt to ashes. It was the "burnt sacrifice" called Korban Olah in the Jewish tradition. In that case, the sacrifice was shared with God alone -- but it was more of an exception than the rule.

In any case, God was the supreme arbiter who insured that your sacrifice was appreciated -- actually, not all sacrifices were appreciated. Some people might try to trick by offering low-quality goods, but God is not easy to fool. In some cases, he didn't appreciate someone's sacrifices at all: do you remember the story of Cain and Abel? God rejected Cain's sacrifice, although we are not told exactly why. In any case, the sacrifice was a way to attribute a certain "price" to the sacrificed goods.

This method of commerce is not very different than the one we use today, it is just not so exactly quantified as when we use money to attach a value to everything. The ancient method works more closely to the principle that the Marxists had unsuccessfully tried to implement "from each according to his ability, to each according to his needs." But don't think that the ancient Sumerians were communists, it is just that the lack of a method of quantification of the commercial transaction generated a certain leeway that could allow the needy access to the surplus available, when it was available. This idea is still embedded in modern religions, think of how the Holy Quran commands the believers to share the water of their wells with the needy, once they have satisfied their needs and those of their animals. Or the importance that the Christian tradition gives to gleaning as a redistribution of the products of the fields. Do you remember the story of Ruth the Moabite in the Bible? That important, indeed.

But there is more. In the case of burnt sacrifices, the value attributed to the goods was "infinite" -- the goods consumed by the flames just couldn't be used again by human beings. It is the concept of Taboo used in Pacific cultures for something that cannot be touched, eaten, or used. We have no equivalent thing in the "market," where we instead suppose that everything has a price.

And then, there came money (the triumph of evil)

The world of the temples of the first 2-3 millennia of human civilizations in the Near East was in some ways alien to ours, and in others perfectly equivalent. But things keep changing and the temples were soon to face competition in a new method of attributing value to goods: money. Coinage is a relatively modern invention, it goes back to mid 1st millennium BCE. But in very ancient times, people did exchange metals by weight -- mainly gold and silver. And these exchanges were normally carried out in temples -- the local God(s) ensured honest weighing. In more than one sense, in ancient times temples were banks and it is no coincidence that our modern banks look like temples. They are temples to a God called "money." By the way, you surely read in the Gospels how Jesus chased the money changers -- the trapezitai -- out of the temple of Jerusalem. Everyone knows that story, but what were the money changers doing in the temple? They were in the traditional place where they were expected to be, where they had been from when bread was baked in ovens for the first time.

So, religion and money evolved in parallel -- sometimes complementing each other, sometimes in competition with each other. But, in the long run, the temples seem to have been the losers in the competition. As currency became more and more commonplace, people started thinking that they didn't really need the cumbersome apparatus of religion, with its temples, priests, and hierodules (the last ones were still appreciated, but now were paid in cash). A coin is a coin is a coin, it is guaranteed by the gold it is made of -- gold is gold is gold. And if you want a good beer, you don't need to make an offer to some weird God or Goddess. Just pay a few coppers for it, and that's done.

The Roman state was among the first in history to be based nearly 100% on money. With the Romans, temples and priests had mainly a decorative role, let's say that they had to find a new market for their services. Temples couldn't be commercial centers any longer, so they reinvented themselves as lofty places for the celebration of the greatness of the Roman Empire. There remained also a diffuse kind of religion in the countryside that had to do with fertility rites, curing sickness, and occasional cursing on one's enemies. That was the "pagan" religion, with the name "pagan" meaning, basically, "peasant."

Paganism would acquire a bad fame in Christian times, but already in Roman times, peasant rites were seen with suspicion. The Romans had one deity: money. An evil deity, perhaps, but it surely brought mighty power to the Romans, but their doom as well, as it is traditional for evil deities. Roman money was in the form of precious metals and when they ran out of gold and silver from their mines, the state just couldn't exist anymore: it vanished. No gold, no empire. It was as simple as that.

The disappearance of the Roman state saw a return of religion, this time in the form of Christianity. The Middle Ages in Europe saw the rise of monasteries to play a role similar to that of temples in Sumerian times. Monasteries were storehouses, manufacturing centers, schools, libraries, and more -- they even had something to do with hierodules. During certain periods, Christian nuns did seem to have played that role, although this is a controversial point. Commercial exchanging and sharing of goods again took a religious aspect, with the Catholic Church in Western Europe playing the role of a bank by guaranteeing that, for instance, ancient relics were authentic. In part, relics played the role that money had played during the Roman Empire, although they couldn't be exchanged for other kinds of goods. The miracle of the Middle Ages in Europe was that this arrangement worked, and worked very well. That is, until someone started excavating silver from mines in Eastern Europe and another imperial cycle started. It is not over to this date, although it is clearly declining.

So, where do we stand now? Religion has clearly abandoned the role it had during medieval times and has re-invented itself as a support for the national state, just as the pagan temples had done in Roman times. One of the most tragic events of Western history is when in 1914, for some mysterious reasons, young Europeans found themselves killing each other by the millions while staying in humid trenches. On both sides of the trenches, Christian priests were blessing the soldiers of "their" side, exhorting them to kill those of the other side. How Christianity could reduce itself to such a low level is one of the mysteries of the Universe, but there are more things in heaven and Earth than are dreamt of in our philosophy. And it is here that we stand. Money rules the world and that's it.

The Problem With Money

Our society is perhaps the most monetized in history -- money pervades every aspect of life for everyone. The US is perhaps the most monetized society ever: for Europeans, it is a shock to discover that many American families pay their children for doing household chores. For a European, it is like if your spouse were asking you to pay for his/her sexual services. But different epochs have different uses and surely it would be shocking for a Sumerian to see that we can get a beer at the pub by just giving the alewives a curious flat object, a "card," that they then give back to us. Surely that card is a powerful amulet from a high-ranking God.

So, everything may be well in the best of worlds, notoriously represented by the Western version of liberal democracy. Powerful market forces, operated by the God (or perhaps Goddess) called Money or, sometimes, "the almighty dollar," ensure that exchanges are efficient, that scarce resources are optimally allocated, and that everyone has a chance in the search for maximizing his/her utility function.

Maybe. But it may also be that something is rotten in the Great Columned Temple of Washington D.C. What's rotten, exactly? Why can't this wonderful deity we call "money" work the way we would it like to, now that we even managed to decouple it from the precious metals it was made of in ancient times?

Well, there is a problem. A big problem. A gigantic problem. It is simply that money is evil. This is another complex story, but let's just say that the problem with evil and good is that evil knows no limits, while good does. In other words, evil is equivalent to chaos, good to order. It has something to do with the definition of "obscenity." There is nothing wrong in human sex, but an excess of sex in some forms becomes obscene. Money can become obscene for exactly this reason: too much of it overwhelms everything else. Nothing is so expensive that it cannot be bought; that's the result of the simple fact that you can attribute a price to everything.

Instead, God is good because She has limits: She is benevolent and merciful. You could see that as a limitation and theologians might discuss why a being that's all-powerful and all-encompassing cannot be also wicked and cruel. But there cannot be any good without an order of things. And order implies limits of some kind. God can do everything but He cannot do evil. That's a no-no. God cannot be evil. Period.

And here is why money is evil: it has no limits, it keeps accumulating. You know that accumulated money is called "capital," and it seems that many people realize that there is something wrong with that idea because "capitalism" is supposed to be something bad. Which may be but, really, capital is one of those polymorphic words that can describe many things, not all of them necessarily bad. In itself, capital is simply the accumulation of resources for future use -- and that has limits, of course. You can't accumulate more things than the things you have. But once you give a monetary value to this accumulated capital, things change. If money has no limits, capital doesn't, either.

Call it capital or call it money, it is shapeless, limitless, a blob that keeps growing and never shrinks. Especially nowadays that money has been decoupled from material goods (at least in part, you might argue that money is linked to crude oil). You could say that money is a disease: it affects everything. Everything can be associated with a number, and that makes that thing part of the entity we call the "market". If destroying that thing can raise that number, somewhere, that thing will be destroyed. Think of a tree: for a modern economist, it has no monetary value until it is felled and the wood sold on the market. And that accumulates more money, somewhere. Monetary capital actually destroys natural capital. You may have heard of "Natural Capitalism" that's supposed to solve the problem by giving a price to trees even before they are felled. It could be a good idea, but it is still based on money, so it may be the wrong tool to use even though for a good purpose.

The accumulation of money in the form of monetary capital has created something enormously different than something that was once supposed to help you get a good beer at a pub. Money is not evil just in a metaphysical sense. Money is destroying everything. It is destroying the very thing that makes humankind survive: the Earth's ecosystem. We call it "overexploitation," but it means simply killing and destroying everything as long as that can bring a monetary profit to someone.


Re-Sacralizing The Ecosystem (why some goods must have infinite prices)

There have been several proposals on how to reform the monetary system, from "local money" to "expiring money," and some have proposed simply getting rid of it. None of these schemes has worked, so far, and getting rid of money seems to be simply impossible in a society that's as complex as ours: how do you pay the hierodules if money does not exist? But from what I have been discussing so far, we could avoid the disaster that the evil deity called money is bring to us simply by putting a limit to it. It is, after all, what the Almighty did with the devil: She didn't kill him, but confined him in a specific area that we call "Hell." Maybe there is a need for hell to exist, we don't know. For sure, we don't want hell to grow and expand everywhere (although it may well be exactly what we are seeing in the world, nowadays).

What does it mean limits to money? It means that some things must be placed outside the monetary realm -- outside the market. If you want to use a metaphor-based definition, some goods must be declared to have an "infinite" monetary price -- nobody can buy them, not billionaires, not even trillionaires, or any even more obscene levels of monetary accumulation. If you prefer, you may use the old Hawai'ian word: Taboo. Or, simply, you decide that some things are sacred, holy, they are beloved by the Goddess, and even thinking of touching them is evil.

Once something is sacred, it cannot be destroyed in the name of profit. That could mean setting aside some areas of the planet, declaring them not open for human exploitation. Or setting limits to the exploitation, not with the idea of maximizing the output of the system for human use, but with the idea to optimize the biodiversity of the area. These ideas are not farfetched. As an example, some areas of the sea have been declared "whale sanctuaries" -- places where whales cannot be hunted. That's not necessarily an all/zero choice. Some sanctuaries might allow human presence and moderate exploitation of the resources of the system. The point is that as long as we monetize the exploitation, then we are back to monetary capitalism and the resource will be destroyed.

Do we need a religion to do that? Maybe there are other ways but, surely, we know that it is a task that religion is especially suitable for. Religion is a form of communication that uses rituals as speech. Rituals are all about sacralization: they define what's sacred by means of sacrifice. These concepts form the backbone of all religions, everything is neatly arranged under to concept of "sacredness" -- what's sacred is nobody's property. We know that it works. It has worked in the past. It still works today. You may be a trillionaire, but you are not allowed to do everything you want just because you can pay for it. You can't buy the right of killing people, for instance. Nor to destroy humankind's heritage. (So far, at least).

Then, do we need a new religion for that purpose? A Gaian religion?

Possibly yes, taking into account that Gaia is not "God" in the theological sense. Gaia is not all-powerful, she didn't create the world, she is mortal. She is akin to the Demiurgoi, the Daimonoi, the Djinn, and similar figures that play a role in the Christian, Islamic and Indian mythologies. The point is that you don't necessarily need the intervention of the Almighty to sacralize something. Even just a lowly priest can do that, and surely it is possible for one of Her Daimonoi, and Gaia is one.

Supposing we could do something like that, then we would have the intellectual and cultural tools needed to re-sacralize the Earth. Then, whatever is declared sacred or taboo is spared by the destruction wrecked by the money-based process: forests, lands, seas, creatures large and small. We could see this as a new alliance between humans and Gaia: All the Earth is sacred to Gaia, and some parts of it are especially sacred and cannot be touched by money. And not just the Earth, the poor, the weak, and the dispossessed among humans, they are just as sacred and must be respected.

All that is not just a question of "saving the Earth" -- it is a homage to the power of the Holy Creation that belongs to the Almighty, and to the power of maintenance of the Holy Creation that belongs to the Almighty's faithful servant, the holy Gaia, mistress of the ecosystem. And humans, as the ancient Sumerians had already understood, are left with the task of respecting, admiring and appreciating what God has created. We do not worship Gaia, that would silly, besides being blasphemous. But through her, we worship the higher power of God.

Is it possible? If history tells us something is that money tends to beat religion when conflict arises. Gaia is powerful, sure, but can she slay the money dragon in single combat? Difficult, yes, but we should remember that some 2000 years ago in Europe, a group of madmen fought and won against an evil empire in the name of an idea that most thought not just subversive at that time, but even beyond the thinkable. And they believed so much in that idea that they accepted to die for it

In the end, there is more to religion than just fixing a broken economic system. There is a fundamental reason why people do what they do: sometimes we use the anodyne name of "communication," sometimes we use the more sophisticated term "empathy," but when we really understand what we are talking about we may not afraid to use the word "love" which, according to our Medieval ancestors, was the ultimate force that moves the universe. And when we deal with Gaia the Goddess, we may have this feeling of communication, empathy, and love. She may be defined as a planetary homeostatic system, but she is way more than that: it is a power of love that has no equals on this planet. But there are things that mere words cannot express. 

The tao that can be told
is not the eternal Tao
The name that can be named
is not the eternal Name.

The unnamable is the eternally real.
Naming is the origin
of all particular things. Free from desire, you realize the mystery.
Caught in desire, you see only the manifestations.

Yet mystery and manifestations
arise from the same source.
This source is called darkness.

Darkness within darkness.
The gateway to all understanding.




Monday, February 7, 2022

Thinking like a Tree. Understanding the Role of Forests in the Ecosystem

The "Seneca Effect" blog deals a lot with collapses and you may find it a little catastrophistic. But I am also exploring other fields in a more positive mood. One is the concept of "holobiont," how living creatures organize themselves to form complex adaptive systems. Here is a post on this subject from my blog "The Proud Holobionts". 


The Greatest Holobiont on Earth: Old-Growth Forests



A "holobiont" is a living creature formed of independent, but cooperating, organisms. It is a wide-ranging concept that can explain many things not just about the ecosystem of our planet, but also about human society, and even more than that. Photo courtesy of Chuck Pezeshky. This post was modified and improved thanks to suggestions received from Anastassia Makarieva.



When was the last time that you walked through an old-growth forest? Do you remember the silence, the stillness of the air, the sensation of awe, the feeling that you are walking in a sacred place? The inside of a forest looks like a cathedral or, perhaps, it is the inside of a cathedral that is built in such a way to look like a forest, with columns as trees and vaults as the canopy.  If you don't have a forest or a cathedral nearby, you can get the same feeling by watching the masterful scene of the forest-God appearing in Miyazaki's movie, "Mononoke no Hime" (The Princess of the Ghosts). 

In a way, when you walk among trees, you feel that you are at home, the home that our remote ancestors left to embark on the mad adventure of becoming human. Yet, for some humans, trees have become enemies to be fought. And, as it is traditional in all wars, they are demonized and despised. It was the English landlord Jonah Barrington who commented about the destruction of Ireland's old forests that "trees are stumps provided by Nature for the repayment of debt." And, as it is traditional in all wars of extermination, not a single enemy was left standing. 

The war metaphor is engrained in our minds of primates, the only mammals that wage war against groups of their own species. So much that sometimes we imagine trees fighting back. In the "Trilogy of the Ring" by Tolkien, we see walking trees, the "ents," standing in arms against humanoid enemies and defeating them. Clearly, we feel guilty for what we have been doing to Earth's forests. A sensation of guilt that goes back to the time when the Sumerian King Gilgamesh and his friend Enkidu were cursed by the Goddess for having destroyed the sacred trees and killed their guardian, Humbaba. From that remote time, we have continued to destroy Earth's forests, and we are still doing that. 

Yet, if there is a war between trees and humans, it is not obvious that humans will win it. Trees are complex, structured, adaptable, tough, and resourceful creatures. Despite the human attempts to destroy them, they survive and even thrive. The most recent data indicate a greening trend of the whole planet [3], probably the result of humans pumping carbon dioxide (CO2) into the atmosphere (this greening is not necessarily a good thing, neither for trees nor for humans [4], [5]). 

But what are trees, exactly? They have no nervous system, no blood, no muscles, just as we have no capability of doing photosynthesis, nor of extracting minerals from the soil. Trees are truly alien creatures, yet they are made of the same building blocks as we are: their cells contain DNA and RNA molecules, their metabolism is based on the reduction of a molecule called adenosine triphosphate (ATP) created by mitochondria inside their cells, and much more. And, in a certain sense, trees do have a brain. The root system of a forest is a network similar to that of a human brain. It has been termed the “Wood-Wide Web” by Suzanne Simard and others [1]. What trees “think” is a difficult question for us, monkeys but, paraphrasing Sir. Thomas Browne [2], what trees are thinking, just like what song the Sirens sang to Ulysses, though puzzling questions are not beyond all conjecture. 

Whether trees think or not, they have the basic characteristics of all complex living systems: they are holobionts. "Holobiont" is a concept popularized by Lynn Margulis as the basic building block of the ecosphere. Holobionts are groups of creatures that collaborate with each other while maintaining their individual characteristics. If you are reading this text, you are probably a human being and, as such, you are also a holobiont. Your body hosts a wide variety of creatures, mostly bacteria, that help you in various tasks, for instance in digesting food. A forest is another kind of holobiont, vaster but also structured in terms of collaborating creatures. Trees could not exist alone, they need the all-important "mycorrhizal symbiosis." It has to do with the presence of fungi in the soil that collaborate with plant roots to create an entity called the “rhizosphere,” the holobiont that makes it possible for a forest to exist. Fungi process the minerals that exist in the soil and turn them into forms that plants can absorb. The plant, in turn, provides the fungi with energy in the form of sugars obtained from photosynthesis. 

So, even though trees are familiar creatures, it is surprising how many things are scarcely known about them and some are not known at all. So, let’s go through a few questions that disclose whole new worlds in front of us. 

First: wood. Everyone knows that trees are made of wood, of course, but why? Of course, its purpose is the mechanical support of the whole plant. But it is not a trivial question. If wood serves for mechanical support, why aren’t our bones made of wood? And why aren’t trees, instead, made of the stuff our bones are made of, mainly solid phosphate?

As usual, if something exists, there is some reason for it to exist. Within some limits, evolution may take different paths simply because it has started moving in a certain direction and it cannot move back. But, as things stand on Earth, wooden trunks are perfectly optimized for their purpose of support of a creature that doesn't move. Tree trunks (not palms, though) grow in concentric layers: it is well known that you can date a tree by counting the growth rings in its trunk. As a new layer grows, the inside layers die. They become just a support for the external layer called the “cambium” which is the living part of the trunk, containing the all-important “xylem”, the ducts that bring water and nutrients from the roots to the leaves. The cambium also contains the "phloem," another set of ducts that move water loaded with sugars in the opposite direction, toward the roots. The inner part of the trunk is dead, so it has no metabolic cost for the tree. Yet, it keeps providing the static support the tree needs. 

The disadvantage is that, because the internal part of the wood is dead, when a branch or a trunk is broken, it cannot be healed by reconnecting the two parts together. In animals, instead, the bones are alive: there is blood flowing through them. So, they can regrow and rebuild the damaged parts. It is probably a necessary feature for animals. They jump, run, fly, fall, roll, and do more acrobatic feats, often resulting in broken bones. Of course, a broken bone is a major danger, especially for a large animal. We don’t know exactly how many animals suffer broken bones and survive, but it seems that it is not uncommon: live bones are a crucial survival feature [6], [7]. But that's not so important for trees: they do not move and the main stress they face is a heavy gust of wind. But trees tend to protect themselves from wind by shouldering against each other – which is, by the way, another typical holobiont characteristic: trees help each other resisting wind, but not because they are ordered to do so by a master tree. It is just the way they are.

That's not just the only feature that makes wood good for trees but not for animals. Another one is that bones, being alive, can grow with the creature they support. They can even be hollow, as in birds, and so be light and resilient at the same time. If our bones were made of wood, we would have to carry around a large weight of deadwood in the inner part of the bone. That's not a problem for trees which, instead, profit from a heavier weight in terms of better stability. And they do not have to run unless they are the fantasy creatures called "ents."  Spectacular, but Tolkien would need to perform some acrobatic feats of biophysics to explain how some trees of Middle Earth can walk around as fast as humans do.

So, there is plenty of logic in the fact that trees use wood as a structural material. They are not the only creatures doing that. Bamboos (bambusoideae), are also wooden, but they are not trees. They are a form of grass that appeared on Earth just about 30 million years ago, when they developed an evolutionary innovation that makes their "trunk” lighter, being hollow. So, they can take much more stress than trees before breaking and that inspired many Oriental philosophers about the advantages of bending without breaking. Among animals, insects and arthropods use a structural material similar to wood, called "chitin." They didn't solve the problem of how to make it grow with the whole organism, so use it as an exoskeleton that they need to replace as they grow.

Now, let's go to another question about trees. How does their metabolism work? You know that trees create their own food, carbohydrates (sugar), by photosynthesis, a process powered by solar light that works by combining water and carbon dioxide molecules. One problem is that sunlight arrives from above, whereas trees extract water from the ground. So, how do they manage to pump water all the way to the leaves? 

We animals are familiar with the way water (actually, blood) is pumped inside our bodies. It is done by an organ called "heart," basically a "positive displacement pump" powered by muscles. Hearts are wonderful machines, but expensive in terms of the energy they need and, unfortunately, prone to failure as we age. But trees, as we all know, have no muscles and no moving parts. There is no “heart” anywhere inside a tree. It is because only the feverish metabolism of animals can afford to use so much energy as it is used in hearts. Trees are slower and smarter (and they live much longer than primates). They use very little energy to pump water by exploiting capillary forces and small pressure differences in their environment. 

"Capillary forces" means exploiting interface forces that appear when water flows through narrow ducts. You exploit that every time you use a paper towel to soak spilled water. It doesn't happen in human-made ducts, nor in the large blood vessels of an animal body. But it is a fundamental feature in the movement of fluids in heartless (not in the bad sense of the term) plants. But capillary forces are not enough, by far. You need also a pressure difference to pull the water high enough to reach the canopy. That you can attain by evaporating water at the surface of leaves. The water that goes away as water vapor creates a small difference in pressure that can pull more water up from below. This is called a "suction pump." You experience it every time you use a straw to drink from a glass. It is, actually, the atmospheric pressure that pushes the water up the straw. 

Now, there is a big problem with suction pumps. If you studied elementary physics in school, you learned that you cannot use a suction pump to pull water higher than about 10 meters because the weight of the water column cannot exceed the atmospheric push. In other words, you wouldn't be able to drink your coke using a straw longer than 10 meters. You probably never made the experiment, but now you know that it won't work! But trees are far higher than ten meters. You just need to visit your local park to find trees that are far taller than that. 

That trees can grow so tall is a little miracle that even today we are not sure we completely understand. The generally accepted theory for how water can be pumped to such heights is called the “cohesion-tension theory” [8].  In short, water behaves, within some limits, as a solid in the live part of a tree trunk, the “xylem.” The ducts do not contain any air and water is pulled up by a mechanism that involves each molecule pulling all the nearby molecules. The story is complicated and not everything is known about it. The point is that trees do manage to pump water to heights up to about 100 meters and even more. There is a redwood tree (Sequoia sempervirens), in California, that reaches a height of 380 feet, (116 m). It is such an exceptional tree, that it has a specific name “Hyperion.” 

Could trees grow even higher? Apparently not, at least not on this planet. We are not sure of what is the main limiting factor. Possibly, the cohesion-tension pumping mechanism that brings water to the leaves ceases to work over a certain height. Or it could be the opposite problem: the phloem becoming unable to carry sugar all the way down to the roots. Or, perhaps, there are mechanical limits to the trunk size that can support a crown large enough to feed the whole tree. 

Nevertheless, some works of fiction imagined trees so huge that humans could build entire cities inside or around the trunk. The first may have been Edgar Rice Burroughs, known for his "Tarzan" novels. In a series set on the planet Venus, in 1932, he imagined trees so big that an entire civilization had taken refuge in them. Just a couple of years later, Alex Raymond created the character of Prince Barin of Arboria for his "Flash Gordon" series. Arboria, as the name says, is a forested region and, again, trees are so big that people can live in them. More recently, you may remember the gigantic "Hometrees" of the Na'vi people of planet Pandora in the movie "Avatar" (2009).  In the real world, some people do build their homes on trees -- it seems to be popular in California. The living quarters must be cramped, to say nothing about the problems with the static stability of the whole contraption. But, apparently, a section of our fantasy sphere still dreams about the times when our remote ancestors were living on trees. 

But why do trees go to such an effort to become tall? If the idea is to collect solar light, which is the business all plants are engaged in, there is just as much of it at the ground level as there is at 100 meters of height. Richard Dawkins was perplexed about this point in his book “The Greatest Show on Earth” (2009), where he said:
“Look at a single tall tree standing proud in the middle of an open area. Why is it so tall? Not to be closer to the sun! That long trunk could be shortened until the crown of the tree was splayed out over the ground, with no loss in photons and huge savings in cost. So why go to all that expense of pushing the crown of the tree up towards the sky? The answer eludes us until we realize that the natural habitat of such a tree is a forest. Trees are tall to overtop rival trees - of the same and other species. … A familiar example is a suggested agreement to sit, rather than stand, when watching a spectacle such as a horse race. If everybody sat, tall people would still get a better view than short people, just as they would if everybody stood, but with the advantage that sitting is more comfortable for everybody. The problems start when one short person sitting behind a tall person stands, to get a better view. Immediately, the person sitting behind him stands, in order to see anything at all. A wave of standing sweeps around the field, until everybody is standing. In the end, everybody is worse off than they would be if they had all stayed sitting.”
Dawkins is a sharp thinker but sometimes he takes the wrong road. Here, he reasons like a primate, actually a male primate (not surprising, because it is what he is). The idea that trees “compete with rival trees – of the same and other species” just doesn’t work. Trees can be male and female, although in ways that primates would find weird, for instance with both male and female organs on the same plant. But male trees do not fight for female trees the way male primates for female primates. A tree would have no advantage in killing its neighbors by shadowing them -- that wouldn't provide "him" or "her" with more food or more sexual partners. Killing the neighbors would perhaps allow a tree to grow a little larger, but, in exchange, it would be more exposed to the gust of wind that could topple it. In the real world, trees protect each other by staying together and avoiding the full impact of gusts of wind. 

It doesn’t always work and if the wind manages to topple a few trees, then a domino effect may ensue and a whole forest may be brought down. In 2018, some 14 million trees were destroyed in Northern Italy by strong gales. The disaster was probably the result of more than a single cause: global warming has created winds of a strength unknown in earlier times. But it is also true that most of the woods that were destroyed were monocultures of spruce, plantations designed for wood production. In the natural world, forests are not made of identical trees, spaced from each other like soldiers in a parade. They are a mix of different species, some taller, some less tall. The interaction among different tree species depends on a number of different factors and there is evidence of complementarity among different species of trees in a mixed forest [9], [10]. The availability of direct sunlight is not the only parameter that affects tree growth and mixed canopies seem to adapt better to variable conditions. 

As a further advantage of being tall, a thick canopy that stands high up protects the ground from sunlight and avoids the evaporation of moisture from the soil, conserving water for the trees. When the sun makes the canopy hotter than the soil, the result is that the air becomes hotter higher up, technically it is called "negative lapse rate" [11].  Since the cold air is below the hot air, convection is much reduced, the air stays still, and water remains in the soil. If that's not completely clear to you, try this experiment: on a hot day, scorching if possible, stand in the sun while wearing a thick wool winter hat for several minutes. Then wear a sombrero. Compare the effects. 

So, you see that having a canopy well separated from the ground is another collective effect generated by trees forming a forest. It doesn't help single trees so much, but it does help the forest in conserving water by generating something that we could call a "holobiont of shadows." Each tree helps the others by shadowing a fraction of the ground, below. And that creates, incidentally, the "cathedral effect" that we experience when we walk through a forest. Again, we see that this point was missed by Dawkins when he said that "That long trunk could be shortened until the crown of the tree was splayed out over the ground, with no loss in photons and huge savings in cost." Another confirmation of how difficult it is for primates to think like trees. 

That doesn’t mean that trees do not compete with other trees or other kinds of plants. They do, by all means. It is typical for a forest especially after an area has been damaged, for instance by fire. In that area, you see growing first the plants that grow faster, typically herbs. Then, they are replaced by shrubs, and finally by trees. The mechanism is generated by the shadowing of the shorter species created by the taller ones. It is a process called "recolonization" that may take decades, or even centuries before the burned patch becomes indistinguishable from the rest of the forest.

These are dynamic processes: fires are part and parcel of the ecosystem, not disasters. Some trees, such as the Australian eucalypti and the African palms seem to have evolved with the specific purpose of burning as fast as possible and spreading flames and sparks around. Have you noticed how palms are “hairy”? They are engineered in such a way to catch fire easily. So much, that it may be dangerous to prune a palm by using a chainsaw while climbing it. A spark from the engine may set on fire the dry wood filaments and that may be very bad for the person strapped to the trunk. It is not that palms could have evolved this feature to defend themselves from chainsaw-yielding monkeys, but they are fast-growing plants that may benefit from how a fire cleans a swat of ground, letting them re-colonize it faster than other species. Note how palms act like kamikaze: single plants sacrifice themselves for the survival of their seed. It is another feature of holobionts. Some primates do the same, but it is rare. 

Other kinds of trees adopt the opposite approach. They optimize their chances for survival when exposed to fire by means of thick bark. The ponderosa pine (Pinus ponderosa) is an example of a plant adopting this strategy. Then there are more tricks: have you ever wondered why some pinecones are so sticky and resinous? The idea is that the resin glues the cone to a branch or to the bark of the tree and keeps the seeds inside. If a fire burns the tree, the resin melts, and the seeds inside are left free to germinate. More evidence that fires are not a bug but a feature of the system. 

In the end, a forest, as we saw, is a typical holobiont. Holobionts do not evolve by the fight for survival that some interpretations of Darwin’s theory had imagined being the rule in the ecosystem. Holobionts can be ruthless when it is necessary to eliminate the unfit, but they aim at an amicable convivence of the creatures that are fit enough. 

The “holobiontic” characteristic of forests is best evidenced by the concept of “biotic pump,” an example of how organisms benefit the holobiont they are part of without the need for hierarchies and planning.



The concept of biotic pump [11] was proposed by Viktor Gorshkov, Anastassia Makarieva, and others, as part of the wider concept of biotic regulation [12]. It is a profound synthesis of how the ecosphere works: it emphasizes its regulating power that keeps the ecosystem from straying away from the conditions that make it possible for biological life to exist. From this work comes the idea that the ecosystemic imbalance we call "climate change" is caused only in part by CO2 emissions. Another important factor is the ongoing deforestation. 

This is, of course, a controversial position. The general opinion among climatologists in the West is that growing a forest has a cooling effect because it removes some CO2 from the atmosphere. But, once a forest has reached its stable state, it has a warming effect on Earth’s climate because its albedo (the light reflected back into space) is lower than that of the bare ground. But studies exist [13] that show how forests cool the Earth not only by sequestering carbon in the form of biomass but because of a biophysical effect related to evapotranspiration. That is, the water evaporates at low altitudes from the leaves, causing cooling. It returns the heat when it condenses in the form of clouds, but the heat emissions at high altitudes are more easily dispersed towards space because the main greenhouse gas, the water, exists in very small concentrations. It may be a minor effect compared to that of the albedo, but it is a point not very well quantified. 

The concept of biotic pump states that forests act as "planetary pumping systems," carrying water from the atmosphere above the oceans up to thousands of kilometers inland. It is the mechanism that generates the “atmospheric rivers” that supply water to lands that are far away from the seas [14]. The biotic pump mechanism depends on quantitative factors that are still little known. But it seems that the water transpired by trees condenses above the forest canopy and the phase transition from gas to liquid generates a pressure drop. This drop pulls air from the surroundings, all the way from the moist air over the sea. This mechanism is what allows the inner areas of the continents to receive sufficient rain to be forested. It doesn’t work everywhere, in Northern Africa, for instance, there are no forests that bring the water inland, and the result is the desert region we call the Sahara. But the biotic pump operates in Northern Eurasia, central Africa, India, Indonesia, Southern, and Northern America.

The concept of the biotic pump is an especially clear example of how holobionts operate. Single trees don’t evaporate water in the air because they somehow “know” that this evaporation will benefit other trees. They do that because they need to generate the pressure difference they need to pull water and nutrients from their roots. In a certain sense, evapotranspiration is an inefficient process because, from the viewpoint of an individual tree, a lot of water (maybe more than 95%) is "wasted" in the form of water vapor and not used for photosynthesis. But, from the viewpoint of a forest, the inefficiency of single trees is what generates the pull of humidity from the sea that makes it possible for the forest to survive. Without the biotic pump, the forest would quickly run out of water and die. It often happens with the rush to "plant trees to stop global warming" that well-intentioned humans are engaged in, nowadays. It may do more harm than good: to stabilize the climate, we do not need just trees, we need forests. 

Note another holobiontic characteristic of trees in forests: they store very little water, individually. They rely almost totally on the collective effect of biotic pumping for the water they need: that's because they are good holobionts! Not all trees are structured in this way. An example is the African baobab, which has a typical barrel-like trunk, where it stores water more or less in the same way as succulent plants (cacti) do. But baobabs are solitary trees, 

Incidentally, evapotranspiration is one of the few points that trees have in common with the primates called "homo sapiens." The sapiens, too, "evapotranspirate" a lot of water out of their skins -- it is called "sweating." But the metabolism of primates is completely different: trees are heterothermic, that is their temperature follows that of their environment. Primates, instead, are homeotherms and control their temperature by various mechanisms, including sweating. But that doesn't create a biotic pump! 

The concept of "biotic pump" generated by the forest holobiont is crucial the correlated one of "biotic regulation," [12] the idea that the whole ecosystem is tightly regulated by the organisms living in it. Natural selection worked at the holobiont level to favor those forests that operated most efficiently as biotic pumps. Plants other than trees and also animals do benefit from the water rivers generated by the forest even though they may not evotranspirate anything. They are other elements of the forest holobiont, an incredibly complex entity where not necessarily everything is optimized, but where, on the whole things move in concert. 

It is a story that we, monkeys, have difficulties in understanding: with the best of goodwill, it is hard for us to think like trees. Likely, the reverse is also true and the behavior of monkeys must be hard to understand for the brain-like network of the tree root system of the forest. It does not matter, we are all holobionts and part of the same holobiont. Eventually, the great land holobiont that we call “forests” merges into the greater planetary ecosystem that includes all the biomes, from the sea to land. It is the grand holobionts that we call “Gaia.” 



References

[1] S. W. Simard, D. A. Perry, M. D. Jones, D. D. Myrold, D. M. Durall, and R. Molina, “Net transfer of carbon between ectomycorrhizal tree species in the field,” Nature, vol. 388, no. 6642, pp. 579–582, Aug. 1997, doi: 10.1038/41557.

[2] T. Browne, “Hydriotaphia,” in Sir Thomas Browne’s works, volume 3 (1835), S. Wilkin, Ed. W. Pickering, 1835.

[3] Shilong Piao et al., “Characteristics, drivers and feedbacks of global greening,” | Nature Reviews Earth & Environment, vol. 1, pp. 14–27.

[4] D. Reay, Nitrogen and Climate Change: An Explosive Story. Palgrave Macmillan UK, 2015. doi: 10.1057/9781137286963.

[5] A. Sneed, “Ask the Experts: Does Rising CO2 Benefit Plants?,” Scientific American. https://www.scientificamerican.com/article/ask-the-experts-does-rising-co2-benefit-plants1/ (accessed Jun. 23, 2021).

[6] S. Hoffman, “Ape Fracture Patterns Show Higher Incidence in More Arboreal Species,” Discussions, vol. 8, no. 2, 2012, Accessed: Jun. 26, 2021. [Online]. Available: http://www.inquiriesjournal.com/articles/799/ape-fracture-patterns-show-higher-incidence-in-more-arboreal-species

[7] C. Bulstrode, J. King, and B. Roper, “What happens to wild animals with broken bones?,” Lancet, vol. 1, no. 8471, pp. 29–31, Jan. 1986, doi: 10.1016/s0140-6736(86)91905-7.

[8] Pi. Cruiziat, “Plant Physiology and Development, Sixth Edition,” in Plant Physiology and Development, Oxfprd University Press, 2006. Accessed: Jun. 24, 2021. [Online]. Available: http://6e.plantphys.net/essay04.03.html

[9] L. J. Williams, A. Paquette, J. Cavender-Bares, C. Messier, and P. B. Reich, “Spatial complementarity in tree crowns explains overyielding in species mixtures,” Nat Ecol Evol, vol. 1, no. 4, pp. 1–7, Mar. 2017, doi: 10.1038/s41559-016-0063.

[10] S. Kothari, R. A. Montgomery, and J. Cavender-Bares, “Physiological responses to light explain competition and facilitation in a tree diversity experiment,” Journal of Ecology, vol. 109, no. 5, pp. 2000–2018, 2021, doi: 10.1111/1365-2745.13637.

[11] Gorshkov, V.G and Makarieva, A.M., “Biotic pump of atmospheric moisture as driver of the hydrological cycle on land,” Hydrology and Earth System Sciences Discussions, vol. 3, pp. 2621–2673, 2006.

[12] V. G. Gorshkov, A. Mikhaĭlovna. Makarʹeva, and V. V. Gorshkov, Biotic regulation of the environment : key issue of global change. Springer-Verlag, 2000. Accessed: Sep. 24, 2017. [Online]. Available: http://www.springer.com/it/book/9781852331818

[13] R. Alkama and A. Cescatti, “Biophysical climate impacts of recent changes in global forest cover,” Science, vol. 351, no. 6273, pp. 600–604, Feb. 2016, doi: 10.1126/science.aac8083.

[14] F. Pearce, “A controversial Russian theory claims forests don’t just make rain—they make wind,” Science | AAAS, Jun. 18, 2020. https://www.sciencemag.org/news/2020/06/controversial-russian-theory-claims-forests-don-t-just-make-rain-they-make-wind (accessed Jun. 25, 2021).




Monday, January 3, 2022

Searching for our Ancestress: a travel to the origin of time

  

Emma Ardinghi, my great-grandmother, animated by deep-fake technologies. She was born in the 1860s and died in the 1930s. Not many of us have images of their ancestors of more than a century ago. But what if some ultra-advanced technology could show your ancestors all the way to back to the creation of the world? (image created on this site. To know more about Emma, see here.) (this post was originally published on "The Proud Holobionts")



Let's imagine a magic trick, or maybe a time machine, or a DNA-reconstructing technology, or some unknown laws of physics. Something, anyway, that shows you your ancestresses, all of them, one by one in a long, long string of mothers that leads you far, far back in time, all the way to the beginning of life on Earth. You are looking maybe into a screen, maybe into a crystal ball, or maybe into the clear waters of a stream in the light of the Moon. Just imagine. 

Ten Generations (250 years). This stream of ten generations lasts ten minutes, one minute for each ancestress. The first face is our mother, of course. You know her well. You see her as a young woman, as you saw her in many old photos. Then, there appears your Grandmother, again as a young woman. Maybe you met her, maybe you remember her only from some faded pictures. She looks a little like you, same skin color and same eyes.  As new images appear you see faces you had never seen and the parade stops with the face of a woman who is your ancestor of 10 generations ago. She was born around 250 years before you, in a century when almost everyone was a peasant and there existed no such things as electricity, cars, or radio and tv. She has the same skin color as you, the same shape of eyes and nose, and probably a similar hair color. Let's assume that she is from Europe or North America and, in this case, she is most likely white. She wears a long cotton skirt and a shirt under a wool corset. She also wears a head cap and wooden sandals, no makeup on her face, her only ornament is a hairpin that she uses to keep her hair in a bun. She looks strong, in good physical shape, not a trace of fat on her body. Her husband appears behind her, a peasant wearing simple clothes and wooden sandals. In the background, you see the brick walls of the house. The windows are small and have wooden shutters. In a corner, a large fireplace. Although she is linked to you by a series of ten generations, her genetic imprint on you has been so diluted that she doesn't look very much like you. Still, if you look into her eyes, you feel a certain kindness, a certain sensation of familiarity. From wherever the image comes from, she locks her eyes into yours and smiles before fading. 

100 Generations (2000 years). Now the images change on the screen every six seconds. In ten minutes you see a hundred ancestresses, one after the other, separated by about 20 years from each other. Tall and not so tall, with long hair, short hair, sturdy, thin, lean, smiling, or maybe sad. There is a certain continuity with these images, the skin color remains about the same as yours: if you are black, they are black, and if you are white, they are white. And if you have slant eyes, they have slant eyes, too. But if you are blond, or you have clear-colored eyes, you'll see this feature disappearing: the eyes of your ancestresses gradually becoming brown, and their hair turns dark brown or black. When you arrive at the end of the sequence, you see someone who lived around 2000 years ago, at the time of the Roman Empire in its highest glory. She looks sturdy, but a little worn out by work and fatigue. She may wear a linen tunic under a heavy woolen cape. She may be a citizen of a large city, or someone inhabiting a small village.  Behind her, her husband shows up. He is wearing similar clothes, a tunic, and a woolen mantle. Behind them, a brick wall with no windows, a fireplace in a corner. You perceive a simple wooden bed and a door. She doesn't look very much like you but, as you look into her face, you note a certain fire in her dark eyes. She is proud to be a citizen of the city or of the village where she lives. She smiles with an air of satisfaction at seeing that remote descendant of hers. For a moment, you are lost in those black eyes of her, then she fades away, and the parade restarts.

1000 generations (15 thousand years). Now the faces flash even faster, less than one second after each other. You see flickering faces, giving you just a quick glance of a few details: a hairpin, earrings, and an especially bright smile. These women maintain the same skin color you have and the same eye shape. But they look robust and sturdy, in good physical shape. The flickering stops with a woman appearing in front of you, looking straight at you. Let's assume that she is white. She wears a jacket and a gown in tanned skin. Around her neck, a leather necklace with hanging ivory teeth, maybe of a shark. Her hair is black, kept together by a leather lace at the back. Around her, you perceive a hut made of animal skin, mammoth tusks planted vertically in the soil are holding the skins together and a fire is burning at the center. Behind her, you see her husband. He wears the same kind of leather clothes and you see a stone-tipped lance leaning against the leather wall. You can almost smell the burned fat of the animals in the hut. You look at her face. She doesn't look like you, not at all. But she has a certain air of pride that you recognize as universal among humans. She smiles at you, she seems to be happy to see this descendant of hers that she sees for such a short time. Then, she fades away.

10,000 generations (150,000 years). It is a whirl of faces that you see dancing on the screen. What you notice most is how the skin of your ancestresses is becoming darker and darker. As the movement stops, you are looking into the face of a black woman. She has curly brown hair, black eyes looking straight into yours. She is tall, she looks athletic. She wears a necklace made with seashells and she wears only a leather belt around her waist as she stands in the bright sun. You know that she is living somewhere in Africa and, behind her, you see the blue of the Ocean. In the distance, the savannah extends all the way to the horizon. Around her, you see stones arranged in circles, traces of a campground where she lives, together with her group. You see her man standing behind her. Like her, he is tall and athletic, wearing only a leather belt around his waist. He holds a stone-tipped spear in his hands. An abyss of time separates you from her, and yet, somehow you recognize each other. You look into her eyes, she looks into yours. She smiles, although she looks a little perplexed at seeing this weird descendant of hers, so remote from her. But she seems to know that her descendants will cross that vast desert, spreading in the Northern forests and everywhere on Earth. She smiles at you as she says something that you don't understand, but that may be a charm of good luck. You smile back as she fades away.

100,000 generations. (one million years). What you see now is a continuous transformation, a morphing. The faces of your ancestresses change, shrink, their bones shift, they develop a pronounced brow ridge. Their skin remains dark, and when the sequence stops, you are in front of the face of this remote ancestress of yours, separated from you by one million years.  You see her standing in the open, among rocks and animal bones. She is completely naked, her skin mostly hairless. She is not tall, but not so much shorter than you. Behind her, a flat savannah's landscape with shrubs and isolated trees. She is different, alien, with her broad nose, her flat skull under her black, long hair. You know that she is a member of the species called "homo erectus," not the same species you belong to, and you are tempted to call her "female," rather than "woman."  And yet, she partakes something of the human nature, you can't miss that. She has round breasts, and rounded buttocks, a human trait that other primates do not share. Nearby, you see her man, holding a hand axe in his hands. She is linked to you by an incredibly long series of motherhoods, each one an improbable event, and yet that chain led exactly to you.  You think for a moment at how a hundred thousand times a man and a woman, your ancestors, mated to generate the unlikely series of creatures that led to what you are. You look at each other in the eyes. Across a huge chasm of millennia, she nods at you, smiling, a gesture unchanged over such a long time. Then, she fades away

One million generations (10 million years). Now you are rushing to the remote origins of the creatures we call "hominina." As the face morphs in front of you, gradually it becomes something not fully human. The sequence stops as you are in front of a face. Still a face, yes, but not the face of a sapiens. You are looking at a female of a different species. She is hairy, small, and sitting in a forested area together with other members of her group. The male is bigger than her, and he looks suspiciously in your direction. You know that these creatures are common ancestors not just to you, but also to chimpanzees and gorillas. She looks at you, tilting her head a little as if she were surprised. You smile at her, she does not respond in kind, but she smacks her lips in your direction. A kiss from an ancestress of you who lived 10 million years ago. Then, the image fades away.

Ten million generations (100 million years). Now the creatures you see morphing on the screen rapidly cease having a face, they now have a snout. You see furry creatures quivering on the screen. The sequence stops to give you a glimpse of a four-footed creature that looks at you, puzzled, for a moment, before scuttling away, disappearing among the vegetation. Was that your ancestress? Yes, she was.  

A hundred million generations (400 million years). Creatures smaller and smaller appear on the screen, they rapidly lose their fur, they become flat, lizard-like animals. Smaller and smaller, until they disappear and you are facing the seashore from an empty beach in the sun. You know that somewhere, under the surface, a female creature is swimming. An extremely remote ancestress of yours. 

Billions of generations (one billion years ago). You are still looking at the sea. An ocean of time goes by and nothing happens. You only know that, down there, there is something alive, quivering, changing. Microscopic unicellular creatures are busy reproducing themselves by mitosis, splitting themselves in two. They are no more males and females, yet they are the origin of what you are, there, below the surface of that remote ocean. 

Billions and billions of generations (5 billion years ago). Now the view moves underwater. In the darkness, you dimly perceive submarine mountains spewing gas bubbles everywhere. You know that those mounds are the factories where organic life is being created. It is strange to think that your so-remote ancestor is not anymore a living creature, but an organic molecule. As you watch, the sea boils in a great turmoil as you enter the Hadean, the age of hell. Then, everything fades into darkness. Before the scene goes away you have a glimpse of large, bright eyes looking at you. The Goddess herself is there, dancing in the emptiness of space while she creates the world. Gaia, the mother of us all. 


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Some images. None of them refers to a specific description in the text of this post, but they can give us some idea of what our ancestresses may have been looking like. 


This woman lived in Tuscany probably during the 2nd century BC, more than 2000 years ago. We know her name, "Larthia Seianti." She was Etruscan, a rich woman (note the armilla bracelet on her arm) who could afford an elaborate sculpture over her sarcophagus. It is a realistic portrait, at least in part. And, curiously, she looks a lot like a Tuscan friend of mine, living in Tuscany nowadays. She is likely one of her ancestress, just as an ancestress of mine. 


The reconstruction of the face of a Neolithic woman who lived about 7,500 years ago in the area that is now called Gibraltar. She has been nicknamed "Calpeia" from the ancient name of the Gibraltar mountain, "Mons Calpe." DNA analysis shows that she, or her immediate ancestors, came to the Iberian peninsula most likely from Anatolia by boat. (source)


The "Venus of Brassenpouy," discovered in 1894 in Southern France. It is a  portrait of someone who lived more than 20,000 years ago. We cannot say whether it is realistic or not, just as we cannot be completely sure that it is a woman's face. But it is perhaps the earliest recongizabòe portrait ever made in human history.  



An impression of how a Paleolithic woman could have looked like, living maybe 20,000-50,000 years ago in Europe. Note her dark skin: it is a remnant of her African ancestry. (source)

 

A reconstruction of the face of a Neanderthal woman (from Earth Archives). She might have lived a few hundred thousand years ago. Several things in this image are uncertain, but note her heavy brow ridges, a typical Neanderthal characteristic. Note her eyes and her skin: the light color is a characteristic of people living in Northern regions. Is she an ancestor of some of us? It is not completely certain but, yes, many of us have Neanderthal genes in their DNA.



The reconstruction of a female Australopithecus who could have been living in Africa some 2 million years ago. If she had the typical human metabolism, she must have been capable of cooling by sweating, a feature incompatible with a thick body hair. And, indeed, she is shown with sparse body hair, although she may well have had none. Note also her human-like round breasts. It is a likely secondary sexual characteristics of hominins which tend to stand upright most of the time. She probably also had round buttocks, as modern women do. An ancestress of ours? Maybe. (source)

 

  


Underwater vents, somewhere at the bottom of the ocean. It is commonly believed that life on Earth started in this kind of environment, some 3-4 billion years ago. Can you see the Goddess Gaia dancing in there? Maybe. (source)